Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
cía
←
Proto-Celtic
*kʷēs
(inherited)
←
Welsh
pwy
(cognate)
←
Proto-Indo-European
*kʷis
(derived)
←
Old Irish
cía
(inherited)